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Age and isotope geochemistry of magmatic rocks of the Lohit Plutonic Complex, eastern Himalaya: implications for the evolution of Transhimalayan arc magmatism

R. K. Bikramaditya, Sun-Lin Chung, A. Krishnakanta Singh, Hao-Yang Lee, Te-Hsien Lin and Yoshiyuki Iizuka
Journal of the Geological Society, 177, 379-394, 30 October 2019, https://doi.org/10.1144/jgs2018-214
R. K. Bikramaditya
1Department of Geology, Banaras Hindu University, Varanasi 221005, India
Roles: [Writing - Original Draft (Equal)]
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Sun-Lin Chung
2Institute of Earth Sciences, Academia Sinica, Taipei 11529, Taiwan
3Department of Geosciences, National Taiwan University, Taipei 10617, Taiwan
Roles: [Data curation (Supporting)], [Funding acquisition (Equal)]
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A. Krishnakanta Singh
4Wadia Institute of Himalayan Geology, G.M.S. Road, Dehradun 795001, India
Roles: [Conceptualization (Lead)], [Writing - Review & Editing (Lead)]
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  • For correspondence: [email protected]
Hao-Yang Lee
2Institute of Earth Sciences, Academia Sinica, Taipei 11529, Taiwan
Roles: [Formal analysis (Lead)]
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Te-Hsien Lin
3Department of Geosciences, National Taiwan University, Taipei 10617, Taiwan
Roles: [Formal analysis (Supporting)]
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Yoshiyuki Iizuka
2Institute of Earth Sciences, Academia Sinica, Taipei 11529, Taiwan
Roles: [Formal analysis (Supporting)]
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Abstract

We present integrated in situ zircon U–Pb and Hf isotope data, along with whole-rock Sr–Nd isotope and geochemical data for plutonic rocks of the Lohit Plutonic Complex of eastern Himalaya to understand the age distribution and petrogenetic–tectonic evolution of the Transhimalayan batholiths in the eastern Himalaya. The plutonic rocks are gabbro, diorite and quartz-diorite in composition, have calc-alkaline signatures with metaluminous character and have an affinity with Gangdese I-type granitoids of southern Tibet. The enrichment of large ion lithophile elements with highly depleted negative Nb anomalies is consistent with their origin in a subduction-related environment. Our laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) zircon U–Pb ages suggest that two major stages of magmatic emplacement took place at c. 145 Ma (Early Cretaceous) for gabbro and c. 100–90 Ma (early Late Cretaceous) for diorite and quartz-diorite. The zircon Hf isotopes in both the gabbro and diorite samples show high positive εHf(t) values between +11 and +20, suggesting crystallization from juvenile crust or depleted mantle derived melts, as also constrained by the low initial 87Sr/86Sr ratios (0.7038–0.7045) and high positive εNd(t) values (+2.9 to +5.9). Results of REE modelling indicate that the source of these rocks is garnet lherzolite. Field observations and mineralogical and geochemical characteristics in conjunction with the isotopic database suggest that the Transhimalayan magmatic rocks in eastern Himalaya were generated by partial melting of the lithospheric mantle wedge and emplaced into the lower crust (c. 25–30 km) during at least two major magmatic events that took place in the Cretaceous period.

Supplementary material: LA-ICP-MS zircon U–Pb and Hf isotope data are available at https://doi.org/10.6084/m9.figshare.c.4665305

  • © 2019 The Author(s). Published by The Geological Society of London. All rights reserved
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Journal of the Geological Society: 177 (2)
Journal of the Geological Society
Volume 177, Issue 2
March 2020
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Age and isotope geochemistry of magmatic rocks of the Lohit Plutonic Complex, eastern Himalaya: implications for the evolution of Transhimalayan arc magmatism

R. K. Bikramaditya, Sun-Lin Chung, A. Krishnakanta Singh, Hao-Yang Lee, Te-Hsien Lin and Yoshiyuki Iizuka
Journal of the Geological Society, 177, 379-394, 30 October 2019, https://doi.org/10.1144/jgs2018-214
R. K. Bikramaditya
1Department of Geology, Banaras Hindu University, Varanasi 221005, India
Roles: [Writing - Original Draft (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Sun-Lin Chung
2Institute of Earth Sciences, Academia Sinica, Taipei 11529, Taiwan
3Department of Geosciences, National Taiwan University, Taipei 10617, Taiwan
Roles: [Data curation (Supporting)], [Funding acquisition (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
A. Krishnakanta Singh
4Wadia Institute of Himalayan Geology, G.M.S. Road, Dehradun 795001, India
Roles: [Conceptualization (Lead)], [Writing - Review & Editing (Lead)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: [email protected]
Hao-Yang Lee
2Institute of Earth Sciences, Academia Sinica, Taipei 11529, Taiwan
Roles: [Formal analysis (Lead)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Te-Hsien Lin
3Department of Geosciences, National Taiwan University, Taipei 10617, Taiwan
Roles: [Formal analysis (Supporting)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Yoshiyuki Iizuka
2Institute of Earth Sciences, Academia Sinica, Taipei 11529, Taiwan
Roles: [Formal analysis (Supporting)]
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  • Search for this author on this site

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Age and isotope geochemistry of magmatic rocks of the Lohit Plutonic Complex, eastern Himalaya: implications for the evolution of Transhimalayan arc magmatism

R. K. Bikramaditya, Sun-Lin Chung, A. Krishnakanta Singh, Hao-Yang Lee, Te-Hsien Lin and Yoshiyuki Iizuka
Journal of the Geological Society, 177, 379-394, 30 October 2019, https://doi.org/10.1144/jgs2018-214
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